Xia An, an ordinary girl who goes about her business in the city. There are no earth-shattering legends in her life, only daily commuting, work, occasional gatherings with friends, and a little confusion when facing herself. The story begins on her twenty-eighth birthday, a celebration she missed because of working overtime, and an unexpected encounter on her way home late at night, like pebbles thrown into a calm lake, quietly creating ripples. This book records these seemingly insignificant moments, choices and subtle growth that constitute her entire world.